Thomas a



(No Model.)

T. A. MAOAULAY.

MECHANICAL MOVEMENT.

Patented June 5, 1883.

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N. PETERS. Filolohlhcgraphsr. Washington. D. c.

' a corresponding direction,

PATENT OFFICE.

THOMAS A. MAGAULAY, OF NEW YORK, N. Y.

MECHANICAL MOVEMENT.

SPECIFICATION forming part of Letters Patent No. 278,806, dated June 5,1883.

Application filed April 9, 1883. (No model.)

To all whom it may concern:

Be it known that I, THOMAS A. MAOAULAY, of the city, county, and Stateof New York, have invented certain new and useful Improvements inMechanical Movements, of which the following, with the accompanyingdrawings, is a specification.

Similar letters refer to like parts.

The object of this invention is to convert continuous rotary motion intooscillating reciprocatory motion in such manner as to cause the axialmotion of a rock shaft or arm to pass through an arc of ninety degrees,(more or less,) as hereinafter more fully described, and pointed out inthe claims.

In the drawings, Figure 1 is a front view. Fig. 2 is a side view of thesame, partly in section.

0 is a rotating shaft, having a crank, D, and crank-pin E.

F is a pitman connected to the crank D by pin E, and to an arm, I, bypin (1. The arm I is pivoted to a fixed point, B, by pin J.

H is an extension of the pitman, connecting it with an arm, K, by pin a,engaging in a slot, a, in said arm K, which is fixed to a shaft, L,journaled in a suitable bearing, B.

The operation is as follows: Botary motion being imparted to the crankD, a reciprocating motion is given to the pitman F and its extension H.This movement of the pitman carries the arm I with it, but in a curvedline concentric with the center of the pivot J, as indicated by thedotted line h. It will be observed that the line 71, followed by thecenter of the pin d, is as it approaches each end of its strokeconstantly nearing a line, f, drawn vertically through the center J,from the time it leaves the point e of the line 9, drawn horizontallythrough the center of the pin d. This movement of the lower end of thepitman in a curved path carries the extension H and its pin a in g andas the pin to engages in'the slot at of the arm K the result of themotion of the arm I upon the arm K to and from the vertical line f ateach end of the stroke is to increase the axial motion of the arm K tothe extent that the pin (1 in the arm and slot.

I approaches the line from a line, n, drawn vertically through the pointe of the position of the center of the pindfarthestfrom the line f. Theincreased axial motion of the arm K above the axial motion of the arm Imay be varied,

if necessary, by varying the relative distances of the points J and L,the throw of the crank D, and the distance between the points J and d ofthe arm I. By increasing the throw of the crank D and decreasing thedistance between the points J and d of the arm I, and making thedistance the greater will be the axial motion of the arm K.

The above-described mechanical movement is well adapted for use in thatclass of sewingmachines known as chines. Whenused in such a machine, thearm I may be fixed to a shaft, and motion may 4 be imparted thereby to afeed-bar, while the shaft L, by reason of its increased axial motion, isbetter adapted for giving the shuttle 70 the requisite movement.

The arm Kis shown slotted, and a pin, a, in the extension H engages insaid slot. This slot is essential because of the varying position of thepin a to and from the center of the arm K; 7 5 but it will be readilyunderstood that any wellknown equivalent of the pin and slot as a com:pensator for the changes of position of the pin win the slot maybe usedinstead of the pin This application is a division of and 80 directcontinuation of an application filed by me December 7, 1880, No. 21,762.

Having described my invention, I claim- 1. The combination of the crankD, pitman F, connected to the arm I, and having a pin, a, 8 5 engagingin a slot, to, of the arm K, or the equivalent of said pin and slot, forincreasing the axial motion of the arm K, substantially as specified.

2. The combination of the crank D, pitman 0 F and extension H, the armI, and the arm K, having shaft L, substantially as specified.

THOS. A. MACAULAY. lVitnesses:

W. A. BARTLETT,. \VM. SECHER.

between the points L and a less,

oscillatingshuttle ma-

